US4623773A - Electrospark machining solution - Google Patents
Electrospark machining solution Download PDFInfo
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- US4623773A US4623773A US06/590,602 US59060284A US4623773A US 4623773 A US4623773 A US 4623773A US 59060284 A US59060284 A US 59060284A US 4623773 A US4623773 A US 4623773A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/08—Working media
Definitions
- the present invention relates to a machining solution intended for use in electrospark machining.
- a so-called "ordinary electrospark machining method" using a mold electrode and a wire type electrospark machining method employing a wire electrode are well known in the art.
- a machining electrode is confronted with a workpiece in a machining solution with a gap between the electrode and workpiece and the workpiece is machined by sparks produced in the gap.
- machining solution is abruptly vaporized by columns of sparks to produce a high pressure which dislodges molten parts of the workpiece.
- the machining solution also serves to cool molten fine metal particles which have been scattered from the workpiece thereby to remove machining chips, decomposed carbon particles, and other unwanted debris from the machining gap.
- the machining solution used with the wire type electrospark machining method is water. Therefore, there is little danger of fire caused by the machining solution.
- an inflammable oil such as mineral oil, which is a good insulator, is generally employed as the machining solution used with the ordinary electrospark machining method because water greatly reduces the machining rate.
- the level of the inflammable machining solution in the machining bath decreases significantly during an electrospark machining operation, the solution may be ignited by the sparks resulting in a fire.
- the ordinary electrospark machining method is disadvantageous in that it is necessary to provide a way of preventing the inflammable machining solution from igniting.
- the ordinary electrospark machining method suffers from a drawback in that, even if a way is provided for preventing ignition of the machining solution, it is impossible to assure that unmanned operation is absolutely safe for long periods.
- the inflammable mineral oil itself involves a problem in that it is malodorous, somewhat poisonous and presents a sanitation problem in that it tends to stick to the hands of the operator.
- a nonflammable oil such as a silicon oil, fluorinated oil or chlorinated oil may be employed as the machining oil.
- silicon oil and fluorinated oil are considerably expensive and chlorinated oil is poisonous.
- a first object of the invention is to provide an electrospark machining solution which is nonflammable and which provides an excellent machining rate.
- a second object of the invention is to provide an electrospark machining solution which has no foul odor and is excellent so far a safety and sanitation are concerned.
- a third object of the invention is to provide an electrospark machining solution which can be prepared at low cost.
- a fourth object of the invention is to provide an electrospark machining solution which has a sufficiently high preservative effect.
- a fifth object of the invention is to provide an electrospark machining solution which has a predetermined insulation resistance and provides a predetermined machining rate.
- an electrospark machining solution comprising primarily an aqueous solution of saccharide to which may be added a preservative agent and/or an anticorrosive agent.
- FIG. 1 is a graphical representation indicating characteristic curves showing machining rate with cane sugar density and viscosity with cane sugar density.
- the invention which as been developed in order to eliminate difficulties accompanying conventional electrospark machining solutions, provides electrospark machining solutions which are nonflammable and do not harm machining performance.
- an aqueous solution of saccharide is employed as an electrospark machining solution.
- a homogeneous saccharide aqueous solution can easily be obtained by dissolving saccharide in water and the fluidity of the saccharide aqueous solution thus obtained can be changed as desired by adjusting its density.
- the saccharide aqueous solution has an insulating characteristic high enough to cause spark discharge between a workpiece and a machining electrode.
- the electrical conductivities of white sugar (cane sugar) with different densities are as indicated in Table 1 below:
- machining rates of the machining solutions according to the invention are several times that of water and are substantially equal to that of conventional machining oil.
- the surfaces of the workpieces machined with machining solutions of the invention are more satisfactory than that obtained using water or conventional machining oil as the machining solution.
- the relationship between the machining rate and the machining solution density will be described with reference to FIG. 1 in which a cane sugar aqueous solution was employed as the machining solution by way of example.
- the machining rate increases.
- the viscosity of the machining liquid increases abruptly.
- the permeability of the machining solution decreases as a result of which it is difficult to remove powder which is created by the electrospark machining. This is undoubtedly unsuitable for electrospark machining.
- the viscosity of the solution increases, the roughness of the machined surface correspondingly increases.
- the optimum machining density ranges from 5% to 55% by weight. If kerosene is used as the machining solution, the machining rate is about 2.1 g/min and the viscosity is about 2 cp at 40° C.
- cane sugar white sugar
- grape sugar grape sugar
- malt sugar cane sugar
- Additives may be added to the sugars.
- the density of the saccharide aqueous solution is not always limited to those described above and it may be varied within an electrospark machining enabling range as indicated in FIG. 1.
- the machining solution of the invention is applicable not only to the ordinary electrospark machining method but also to other electrospark methods where a wire is used as the machining electrode.
- machining a workpiece with the nonflammable saccharide aqueous solution of the invention as the machining solution no fire is caused even if a mistake is made during the machining operation. Accordingly, an electrospark machining device can be so designed that it automatically machines workpieces which is an important labor-saving feature.
- the machining solution of the invention produces no foul odor. Even if the machining solution sticks to the hands of the operator, there is no danger as the solution is not poisonous.
- the machining solution of the invention is free from sanitary hazards and can be used in safety which contributes to an improvement of the machining work efficiency.
- the machining solution of the invention can be readily prepared.
- An anticorrosive may be employed as an additive to the saccharide aqueous solution of the invention in order to eliminate a difficulty that, when an electrospark machining operation is carried out using saccharide aqueous solution, for long periods of time, the workpiece corrodes during the machining operation.
- appropriate anticorrosives are sodium nitride, sodium polyphosphate, sodium dichromate and sodium silicate.
- triethanol amine in an amount of 0.05 to 0.1% by the weight of the nonflammable machining solution is most suitable in terms of its density, insulating properties and the machining rate provided.
- a preservative may be employed as an additive to the above-described saccharide aqueous solution.
- the use of a preservative is effective in eliminating the difficulty that, when an electrospark machining operation is carried out with a nonflammable machining solution including saccharide for long periods of time, the machining solution may be spoiled during the machining operation thus reducing the service life of an ion exchange bath which is provided for maintaining the resistivity of the machining solution.
- Electrospark machining solutions prepared by adding benzoic acid, salicylic acid and dehydroacetic acid as preservatives to nonflammable machining solutions including saccharide aqueous solution have been tested. However, with these preservatives it has been difficult to obtain sufficient preservative effects with an acceptable insulation resistance.
- the insulation resistance property will be discussed in more detail. If benzoic acid of 0.1% by weight is added to the nonflammable machining solution including the saccharide solution, the resulting resistivity is 2.3 ⁇ 10 3 ⁇ cm, if 0.1% of salicylic acid is added thereto, the resistivity is 8.0 ⁇ 10 2 ⁇ cm, and if dehydroacetic acid of 0.1% is added thereto, the resistivity is 9.5 ⁇ 10 3 ⁇ cm. In order to obtain a preferred insulation resistance of 1 ⁇ 10 4 ⁇ cm, it is necessaryy to reduce the density of the preservative to a considerably low value. A solution with a preservative the density of which is thus reduced has a considerably low preservative effect to the extent that it is not practical for use as a machining solution.
- a machining solution has been prepared by adding an alkyl para-hydroxybenzoate, specifically ethyl para-hydroxybenzoate of 0.01% to 0.1% by weight to the nonflammable machining solution containing saccharide solution.
- Table 3 indicates the relationships between machining solutions of different densities, time until the solutions are spoiled, and the resistivities of the solutions after thirty days.
- a machining solution containing ethyl para-hydroxybenzoate in an amount of 0.01 to 0.1% has the desired insulation resistance (1 ⁇ 10 4 ⁇ cm) and maintains it for a long period of time and has a sufficiently high preservative effect.
- Table 4 indicates the machining rates for electrospark machining solutions. As is clear from Table 4, an electrospark machining solution prepared by adding 0.1% by wieght of para-hyroxybenzoate 0.1% to 30% cane sugar solution is substantially equal in machining rate to that prepared using 30% cane sugar solution.
- a machining solution which has the desired insulation resistance and machining rate and has a sufficiently high preservative effect by adding 0.01 to 0.1% by weight ethyl para-hydroxybenzoate to the described nonflammable machining solution containing saccharide solution.
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Abstract
A nonflammable electrospark machining solution which provides a high machining rate composed primarily of a saccharide such as cane sugar, fruit sugar or malt sugar with the density of saccharide being 5 to 55% by weight. A preservative may be added such as benzoic acid, salicylic acid, dehydroacetic acid or ethyl para-hydroxybenzoate with the latter being preferred in an amount of 0.01 to 0.1% by weight of the machining solution. Also, an anticorrosive such as sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine is preferably added in an amount of 0.05 to 0.1% by weight of the machining solution.
Description
This is a Continuation of application Ser. No. 227,903 filed Jan. 23, 1981, now abandoned.
The present invention relates to a machining solution intended for use in electrospark machining.
A so-called "ordinary electrospark machining method" using a mold electrode and a wire type electrospark machining method employing a wire electrode are well known in the art. In each of these methods, a machining electrode is confronted with a workpiece in a machining solution with a gap between the electrode and workpiece and the workpiece is machined by sparks produced in the gap.
During the electrospark machining operation, machining solution is abruptly vaporized by columns of sparks to produce a high pressure which dislodges molten parts of the workpiece. The machining solution also serves to cool molten fine metal particles which have been scattered from the workpiece thereby to remove machining chips, decomposed carbon particles, and other unwanted debris from the machining gap.
In general, the machining solution used with the wire type electrospark machining method is water. Therefore, there is little danger of fire caused by the machining solution. On the other hand, an inflammable oil such as mineral oil, which is a good insulator, is generally employed as the machining solution used with the ordinary electrospark machining method because water greatly reduces the machining rate. Unfortunately, if the level of the inflammable machining solution in the machining bath decreases significantly during an electrospark machining operation, the solution may be ignited by the sparks resulting in a fire. Thus, the ordinary electrospark machining method is disadvantageous in that it is necessary to provide a way of preventing the inflammable machining solution from igniting.
However, since a inflammable machining solution must be used as a practical matter, the ordinary electrospark machining method suffers from a drawback in that, even if a way is provided for preventing ignition of the machining solution, it is impossible to assure that unmanned operation is absolutely safe for long periods. Furthermore, the inflammable mineral oil itself involves a problem in that it is malodorous, somewhat poisonous and presents a sanitation problem in that it tends to stick to the hands of the operator.
In order to prevent fires, a nonflammable oil such as a silicon oil, fluorinated oil or chlorinated oil may be employed as the machining oil. However, silicon oil and fluorinated oil are considerably expensive and chlorinated oil is poisonous.
Accordingly, a first object of the invention is to provide an electrospark machining solution which is nonflammable and which provides an excellent machining rate. A second object of the invention is to provide an electrospark machining solution which has no foul odor and is excellent so far a safety and sanitation are concerned.
A third object of the invention is to provide an electrospark machining solution which can be prepared at low cost.
A fourth object of the invention is to provide an electrospark machining solution which has a sufficiently high preservative effect.
A fifth object of the invention is to provide an electrospark machining solution which has a predetermined insulation resistance and provides a predetermined machining rate.
The foregoing objects and other objects of the invention are met by an electrospark machining solution comprising primarily an aqueous solution of saccharide to which may be added a preservative agent and/or an anticorrosive agent.
In the accompanying drawing, the single FIG. 1 is a graphical representation indicating characteristic curves showing machining rate with cane sugar density and viscosity with cane sugar density.
The invention, which as been developed in order to eliminate difficulties accompanying conventional electrospark machining solutions, provides electrospark machining solutions which are nonflammable and do not harm machining performance. In accordance with the invention, an aqueous solution of saccharide is employed as an electrospark machining solution.
A homogeneous saccharide aqueous solution can easily be obtained by dissolving saccharide in water and the fluidity of the saccharide aqueous solution thus obtained can be changed as desired by adjusting its density. The saccharide aqueous solution has an insulating characteristic high enough to cause spark discharge between a workpiece and a machining electrode. By way of example, the electrical conductivities of white sugar (cane sugar) with different densities are as indicated in Table 1 below:
TABLE 1
______________________________________
White sugar density
(% by weight) 50% 40% 30% 20%
______________________________________
Electrical conductivity
2.30 3.75 4.79 4.52
25° C. μυ/cm
______________________________________
A preferred embodiment of the invention will be described. In order to compare machining rates which are obtained employing saccharide aqueous solutions for machining solutions with those which are provided employing conventional machining oil and water as the machining solutions, quenched steels were electrospark-machined with a copper machining electrode under the same electrical conditions. The results of the electrospark machining tests are as indicated in Table 2 below:
TABLE 2
______________________________________
Machining solution Machining rate
______________________________________
Conventional machining oil
1.8 g/min
Water 0.5
20% (by weight) saccharide
1.6
aqueous solution
30% (by weight) saccharide
1.7
aqueous solution
______________________________________
As is apparent from Table 2, machining rates of the machining solutions according to the invention are several times that of water and are substantially equal to that of conventional machining oil. In addition, it has been found that the surfaces of the workpieces machined with machining solutions of the invention are more satisfactory than that obtained using water or conventional machining oil as the machining solution.
The relationship between the machining rate and the machining solution density will be described with reference to FIG. 1 in which a cane sugar aqueous solution was employed as the machining solution by way of example. As the machining solution density increases, the machining rate increases. However, it should be noted that, when the machining solution density exceeds 55% by weight, the viscosity of the machining liquid increases abruptly. As the viscosity of the machining solution increases as described above, the permeability of the machining solution decreases as a result of which it is difficult to remove powder which is created by the electrospark machining. This is undoubtedly unsuitable for electrospark machining. In addition, as the viscosity of the solution increases, the roughness of the machined surface correspondingly increases. Therefore, it can be considered that the optimum machining density ranges from 5% to 55% by weight. If kerosene is used as the machining solution, the machining rate is about 2.1 g/min and the viscosity is about 2 cp at 40° C.
In the above-described embodiment, cane sugar (white sugar) is used. However, the same effects can be obtained using grape sugar, fruit sugar and malt sugar. These sugars may be used solely or in combination. Additives may be added to the sugars. The density of the saccharide aqueous solution is not always limited to those described above and it may be varied within an electrospark machining enabling range as indicated in FIG. 1. The machining solution of the invention is applicable not only to the ordinary electrospark machining method but also to other electrospark methods where a wire is used as the machining electrode.
In machining a workpiece with the nonflammable saccharide aqueous solution of the invention as the machining solution, no fire is caused even if a mistake is made during the machining operation. Accordingly, an electrospark machining device can be so designed that it automatically machines workpieces which is an important labor-saving feature. The machining solution of the invention produces no foul odor. Even if the machining solution sticks to the hands of the operator, there is no danger as the solution is not poisonous. Thus, the machining solution of the invention is free from sanitary hazards and can be used in safety which contributes to an improvement of the machining work efficiency. In addition, the machining solution of the invention can be readily prepared.
An anticorrosive may be employed as an additive to the saccharide aqueous solution of the invention in order to eliminate a difficulty that, when an electrospark machining operation is carried out using saccharide aqueous solution, for long periods of time, the workpiece corrodes during the machining operation. Examples of appropriate anticorrosives are sodium nitride, sodium polyphosphate, sodium dichromate and sodium silicate. However, especially triethanol amine in an amount of 0.05 to 0.1% by the weight of the nonflammable machining solution is most suitable in terms of its density, insulating properties and the machining rate provided.
Furthermore, a preservative may be employed as an additive to the above-described saccharide aqueous solution. The use of a preservative is effective in eliminating the difficulty that, when an electrospark machining operation is carried out with a nonflammable machining solution including saccharide for long periods of time, the machining solution may be spoiled during the machining operation thus reducing the service life of an ion exchange bath which is provided for maintaining the resistivity of the machining solution.
Electrospark machining solutions prepared by adding benzoic acid, salicylic acid and dehydroacetic acid as preservatives to nonflammable machining solutions including saccharide aqueous solution have been tested. However, with these preservatives it has been difficult to obtain sufficient preservative effects with an acceptable insulation resistance.
The insulation resistance property will be discussed in more detail. If benzoic acid of 0.1% by weight is added to the nonflammable machining solution including the saccharide solution, the resulting resistivity is 2.3×103 Ωcm, if 0.1% of salicylic acid is added thereto, the resistivity is 8.0×102 Ωcm, and if dehydroacetic acid of 0.1% is added thereto, the resistivity is 9.5×103 Ωcm. In order to obtain a preferred insulation resistance of 1×104 Ωcm, it is necesary to reduce the density of the preservative to a considerably low value. A solution with a preservative the density of which is thus reduced has a considerably low preservative effect to the extent that it is not practical for use as a machining solution.
In order to eliminate the above-described difficulty and to provide an electrospark machining solution which can provide the desired insulation resistance and machining rate as in a nonflammable machining solution containing saccharide solution and is yet sufficiently effective in preservation, a machining solution has been prepared by adding an alkyl para-hydroxybenzoate, specifically ethyl para-hydroxybenzoate of 0.01% to 0.1% by weight to the nonflammable machining solution containing saccharide solution.
The relation between the density of ethyl para-hydroxybenzoate and the preservative effect will be specifically described. Table 3 below indicates the relationships between machining solutions of different densities, time until the solutions are spoiled, and the resistivities of the solutions after thirty days.
TABLE 3
______________________________________
Period until
Resistivity
Solution spoiled in 30 days
______________________________________
30% cane sugar aqueous so-
22 days 2.5 × 10.sup.4 Ωcm
lution
30% cane sugar aqueous so-
30 days 4.7 × 10.sup.4 Ωcm
lution + 0.005% ethyl para-
hydroxybenzoate
30% cane sugar aqueous so-
65 days 9.3 × 10.sup.4 Ωcm
lution + 0.01% ethyl para-
hydroxybenzoate
30% cane sugar aqueous so-
more than 1.2 × 10.sup.5 Ωcm
lution + 0.1% ethyl para-
65 days
hydroxybenzoate
______________________________________
As is apparent from Table 3, a machining solution containing ethyl para-hydroxybenzoate in an amount of 0.01 to 0.1% has the desired insulation resistance (1×104 Ωcm) and maintains it for a long period of time and has a sufficiently high preservative effect.
Now, the relation between the density of ethyl para-hydroxybenzoate and the machining rate will be described.
Table 4 indicates the machining rates for electrospark machining solutions. As is clear from Table 4, an electrospark machining solution prepared by adding 0.1% by wieght of para-hyroxybenzoate 0.1% to 30% cane sugar solution is substantially equal in machining rate to that prepared using 30% cane sugar solution.
TABLE 4
______________________________________
Machining solution Machining rate
______________________________________
30% cane sugar aqueous solu-
1.80 g/min
tion
30% cane sugar aqueous solu-
1.83 g/min
tion + 0.1% ethyl para-
hydroxybenzoate
______________________________________
As is apparent from the above description, in order to prepare a machining solution which is equivalent in insulation resistance and machining rate to a nonflammable machining solution containing saccharide solution and which is sufficiently high in preservative effect, it is preferable to add ethyl para-hydroxybenzoate of 0.01 to 0.1% by weight to the cane sugar aqueous solution.
According to the invention, a machining solution is provided which has the desired insulation resistance and machining rate and has a sufficiently high preservative effect by adding 0.01 to 0.1% by weight ethyl para-hydroxybenzoate to the described nonflammable machining solution containing saccharide solution.
Claims (40)
1. An electrospark machining device comprising an electrospark machining electrode positioned in a non-flammable electrospark machining solution consisting essentially of an aqueous solution of saccharide, said machining solution having an electrical insulating characteristic high enough to cause spark discharge, and power means to produce a spark discharge (high power density arcs) in a gap between said electrode and an electrically conductive work piece, whereby spark discharges from said electrode are produced in a gap between said electrode and said work piece to machine said work piece when said device is used for electrospark machining.
2. An electrospark machining device comprising an electrospark machining electrode positioned in a non-flammable electrospark mmachining solution having an insulation resistance of at least 1×104 Ωcm, said solution consisting essentially of an aqueous solution of saccharide, and power means to produce a spark discharge (high power density arcs) in a gap between said electrode and an electrically conductive work piece, whereby spark discharges from said electrode are produced in a gap between said electrode and said work piece to machine said work piece when said device is used for electrospark machining.
3. The electrospark machining device as claimed in claim 1 or 2 in which said saccharide comprises at least one sugar selected from the group consisting of cane sugar, fruit sugar and malt sugar.
4. The electrospark machining device as claimed in claim 1 or 2 in which the amount of saccharide in said aqueous solution of saccharide is from 5 to 55% by weight of said aqueous solution.
5. The electrospark machining device as claimed in claim 1 or 2, said aqueous solution further comprising a preservative.
6. The electrospark machining device as claimed in claim 5 wherein said preservative is selected from the group consisting of benzoic acid, salicylic acid, dehydroacetic acid and ethyl para-hydroxybenzoate.
7. The electrospark machining device as claimed in claim 6 in which said preservative is alkyl para-hydroxybenzoate.
8. The electrospark machining device as claimed in claim 6 in which said preservative is ethyl para-hydroxybenzoate of 0.01 to 0.1% by weight of said nonflammable machining solution.
9. The electrospark machining device as claimed in claim 1 or 2 said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
10. The electrospark machining device as claimed in claim 1 or 2 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
11. The electrospark machining device as claimed in claim 3 in which the amount of saccharide in said aqueous solution of saccharide is from 5 to 55% by weight of said aqueous solution.
12. The electrospark machining device as claimed in claim 3 said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
13. The electrospark machining device as claimed in claim 5 said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
14. The electrospark machining device as claimed in claim 6 said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
15. The electrospark machining device as claimed in claim 7 further said aqueous solution comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
16. The electrospark machining device as claimed in claim 8 further said aqueous solution comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
17. The electrospark machining device as claimed in claim 3 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
18. The electrospark machining device as claimed in claim 5 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
19. The electrospark machining device as claimed in claim 6 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
20. The electrospark machining device as claimed in claim 7 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
21. A process comprising the steps of
(a) disposing an electrically conductive workpiece to be machined in a non-flammable electrospark machining solution consisting essentially of an aqueous solution of saccharide and having a high electrical insulating characteristic, and
(b) applying a sufficient electrical voltage between said workpiece and an electrode positioned in said electrospark machining solution to produce spark discharges (high power density arcs) from said electrode in a gap between said electrode and said workpiece to electrospark machine said workpiece.
22. A process comprising the steps of
(a) disposing an electrically conductive workpiece to be machined in a non-flammmable electrospark machining solution having an insulation resistance of at least 1×104 Ωcm, said solution consisting essentially of an aqueous solution of saccharide, and
(b) applying a sufficient electrical voltage between said workpiece and an electrode positioned in said electrospark machining solution to produce spark discharges (high power density arcs) from said electrode in a gap between said electrode and said workpiece to electrospark machine said workpiece.
23. The process as claimed in claim 21 or 22 in which said saccharide comprises at least one sugar selected from the group consisting of cane sugar, fruit sugar and malt sugar.
24. The process as claimed in claim 21 or 22 in which the amount of saccharide in said aqueous solution of saccharide is from 5 to 55% by weight of said aqueous solution.
25. The process as claimed in claim 11 or 22, said aqueous solution further comprising a preservative.
26. The process as claimed in claim 25 wherein said preservative is selected from the group consisting of benzoic acid, salicylic acid, dehydroacetic acid and ethyl para-hydroxybenzoate.
27. The process as claimed in claim 26 in which said preservative is alkyl para-hydroxybenzoate.
28. The process as claimed in claim 26 in which said preservative is ethyl para-hydroxybenzoate of 0.01 to 0.1% by weight of said nonflammable machining solution.
29. The process as claimed in claim 21 or 22, said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
30. The process as claimed in claim 21 or 22 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
31. The process as claimed in claim 23 in which the amount of saccharide in said aqueous solution of saccharide is from 5 to 55% by weight of said aqueous solution.
32. The process as claimed in claim 23, said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
33. The process as claimed in claim 25, said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
34. The process as claimed in claim 26, said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
35. The process as claimed in claim 27, said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
36. The process as claimed in claim 28 said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
37. The process as claimed in claim 23 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
38. The process as claimed in claim 25 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
39. The process as claimed in claim 26 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
40. The process as claimed in claim 27 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP909580A JPS56107843A (en) | 1980-01-29 | 1980-01-29 | Electric discharge machining liquid |
| JP55-9095 | 1980-01-29 | ||
| JP11922680A JPS5748430A (en) | 1980-08-29 | 1980-08-29 | Electric discharge machining liquid |
| JP55-119226 | 1980-08-29 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06227903 Continuation | 1981-01-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US4623773A true US4623773A (en) | 1986-11-18 |
Family
ID=26343749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/590,602 Expired - Fee Related US4623773A (en) | 1980-01-29 | 1984-03-19 | Electrospark machining solution |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4623773A (en) |
| CH (1) | CH648780A5 (en) |
| DE (1) | DE3102207A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4833944A (en) * | 1986-08-23 | 1989-05-30 | Fuji Jukogyo Kabushiki Kaisha | Transmission ratio control system for a continuously variable transmission |
| US5035781A (en) * | 1989-07-19 | 1991-07-30 | Jenoptik Jena Gmbh | Electrolyte for the production of black surface layers on light metals |
| US5081333A (en) * | 1989-03-17 | 1992-01-14 | Mitsubishi Denki Kabushiki Kaisha | Electric discharge machining fluid with a fatty acid amide additive for rust inhibition |
| WO2009063018A1 (en) * | 2007-11-13 | 2009-05-22 | Agilan Gmbh | Aqueous iron dextran preparation having one or more para-hydroxybenzoate compounds and/or salts thereof |
| CN104289773A (en) * | 2014-10-30 | 2015-01-21 | 苏州市宝玛数控设备有限公司 | Environment-friendly wire electrical discharge machining liquid |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3105096A1 (en) * | 1980-02-18 | 1981-12-10 | Mitsubishi Denki K.K., Tokyo | Spark erosion machining solution and its application |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2937940A (en) | 1957-07-01 | 1960-05-24 | Eltex Chemical Corp | Selective stripping of electroplated metals |
| US3269964A (en) | 1964-10-26 | 1966-08-30 | Miles Lab | Water dispersible form of dialdehyde polysaccharides and process therefor |
| US3334210A (en) | 1964-05-22 | 1967-08-01 | Cincinnati Milling Machine Co | Electro-discharge machining fluid and method |
| US3389066A (en) | 1964-06-03 | 1968-06-18 | Kyowa Hakko Kogyo Kk | Method for electrolytically polishing iron and iron alloys |
| US3766165A (en) | 1966-08-17 | 1973-10-16 | Pfizer | Polysaccharides and their preparation |
| US4039662A (en) | 1975-12-04 | 1977-08-02 | Alcon Laboratories, Inc. | Ophthalmic solution |
| US4148699A (en) | 1976-07-20 | 1979-04-10 | Heritage Silversmiths Limited | Electropolishing of stainless steel |
-
1981
- 1981-01-23 DE DE3102207A patent/DE3102207A1/en active Granted
- 1981-01-29 CH CH565/81A patent/CH648780A5/en not_active IP Right Cessation
-
1984
- 1984-03-19 US US06/590,602 patent/US4623773A/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2937940A (en) | 1957-07-01 | 1960-05-24 | Eltex Chemical Corp | Selective stripping of electroplated metals |
| US3334210A (en) | 1964-05-22 | 1967-08-01 | Cincinnati Milling Machine Co | Electro-discharge machining fluid and method |
| US3389066A (en) | 1964-06-03 | 1968-06-18 | Kyowa Hakko Kogyo Kk | Method for electrolytically polishing iron and iron alloys |
| US3269964A (en) | 1964-10-26 | 1966-08-30 | Miles Lab | Water dispersible form of dialdehyde polysaccharides and process therefor |
| US3766165A (en) | 1966-08-17 | 1973-10-16 | Pfizer | Polysaccharides and their preparation |
| US4039662A (en) | 1975-12-04 | 1977-08-02 | Alcon Laboratories, Inc. | Ophthalmic solution |
| US4148699A (en) | 1976-07-20 | 1979-04-10 | Heritage Silversmiths Limited | Electropolishing of stainless steel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4833944A (en) * | 1986-08-23 | 1989-05-30 | Fuji Jukogyo Kabushiki Kaisha | Transmission ratio control system for a continuously variable transmission |
| US5081333A (en) * | 1989-03-17 | 1992-01-14 | Mitsubishi Denki Kabushiki Kaisha | Electric discharge machining fluid with a fatty acid amide additive for rust inhibition |
| US5035781A (en) * | 1989-07-19 | 1991-07-30 | Jenoptik Jena Gmbh | Electrolyte for the production of black surface layers on light metals |
| WO2009063018A1 (en) * | 2007-11-13 | 2009-05-22 | Agilan Gmbh | Aqueous iron dextran preparation having one or more para-hydroxybenzoate compounds and/or salts thereof |
| CN104289773A (en) * | 2014-10-30 | 2015-01-21 | 苏州市宝玛数控设备有限公司 | Environment-friendly wire electrical discharge machining liquid |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3102207C2 (en) | 1989-04-20 |
| CH648780A5 (en) | 1985-04-15 |
| DE3102207A1 (en) | 1981-11-19 |
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